Materials Literature
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Abstract Recent research progress in catalytic systems for potential use with hydrogen peroxide in industrial chemical synthesis is reviewed, with special focus on work published in the last five years. The main types of chemistry employed are critically appraised regarding their suitability for industrial exploitatio…
The properties of metal clusters and nanoparticles are attracting more and more attention in fundamental and applied research. The application of such structures in heterogeneous catalysis is a particularly important area. Nevertheless, there is only limited fundamental knowledge about the dependence of adsorption beh…
Various effects that liquid and solid media produce on the experimental activation energy of a reaction involving a single chemical step are discussed. The effects are experimentally observed as significant variations in the activation energy with temperature or extent of reaction. Since these phenomena are inconsiste…
Hollow polyelectrolyte capsules have been recently introduced as a novel type of artificial smart material. Here is reported the successful filling of polyelectrolyte capsules based on human erythrocytes with various dye compounds using a novel method of selective precipitation. Control of surface properties and condi…
Superelastic Nitinol is now a common and well-known engineering material in the medical industry. While the greater flexibility of the alloy drives many of its applications, there are also a large number of lesser-known advantages of Nitinol in medical devices. This paper reviews 7 of these less-obvious but very impor…
Textured Nb‐doped bismuth titanate ceramics (Bi 4 Ti 3− x /5 ‐ Nb x /5 O 12 , where x = 0.02) were fabricated by templated grain growth. It was found that the use of a fine precursor powder led to enhanced densification of the ceramic, while Nb doping reduced electrical conduction and dielectric loss, which enabled po…
Two new Keggin unit supported transition metal complexes, [Ni(2,2′-bipy)3]1.5[PW12O40Ni(2,2′-bipy)2(H2O)]·0.5H2O 1 and [Co(1,10′-phen)3]1.5[PMo12O40Co(1,10′,-phen)2- (H2O)]·0.5H2O 2, are synthesized by a hydrothermal method; complex 1 is characterized by X-ray crystallography, showing that the [Ni(2,2′-bipy)2(H2O)]2+…
The microstructure and shape-memory properties of norbornyl–POSS hybrid copolymers having either cyclohexyl corner groups (CyPOSS) or cyclopentyl corner groups (CpPOSS) were investigated by transmission electron microscopy and thermomechanical analysis. Here, POSS refers to the polyhedral oligomeric silsesquioxane mac…
Abstract Basic characteristics of heteropolyacids as green catalysts are overviewed, focusing on the various reaction fields in which the heteropolyacid catalysts function as acid and oxidation catalysts, and then two industrial processes which were made very green by the use of heteropolyacid catalysts in liquid biph…
Hollow spheres of zeolite have been fabricated through a layer-by-layer technique using polystyrene spheres as templates and nanozeolites as ‘building blocks’, followed by calcination.
A comprehensive and systematic study on Sm(Co/sub bal/Fe/sub v/Cu/sub y/Zr/sub x/)/sub z/ magnets is made to completely understand the effects of composition and processing on their magnetic properties. These studies include the compositions required for the formation of cellular/lamellar microstructure, the effects o…
A crucial factor in tissue engineering of heart valves is the type of scaffold material. In the following study, we tested three different biodegradable scaffold materials, polyglycolic acid (PGA), polyhydroxyalkanoate (PHA), and poly-4-hydroxybutyrate (P4HB), as scaffolds for tissue engineering of heart valves. We mo…
The optical and electronic properties of the phthalocyanine (Pc) macrocycle make it suitable for a wide range of applications. The enormous diversity of Pc-containing polymers, developed over thirty years of research, offers the prospect of readily processed materials in which covalent linkages can be used to control…
Several kinds of bromo substituted organic conjugation compounds including chalcones, α-cinnamylideneacetophenones, benzophenones, stilbenes and diphenylacetylenes have been synthesized, and their powder second harmonic generation (SHG) efficiency, cut-off wavelength λcut-off and thermal stability have been studied. T…
Block copolymers are well-known for their large number of microphase morphologies on mesoscopic length scales. After a short review of the different morphologies observed in binary block copolymers and ternary triblock copolymers, the self-assembling in blends of different block copolymers into common superlattices is…
The crystal chemistry of Fe in four nontronites (Garfield, Panamint Valley, SWa-1, and NG-1) was investigated by chemical analysis, X-ray goniometry, X-ray absorption pre-edge spectroscopy, powder and polarized extended X-ray absorption fine structure (EXAFS, P-EXAFS) spectroscopy, and X-ray diffraction. The four refe…
Microporosity within the pore walls of ordered mesoporous silica SBA-15 was confirmed by physisorption; the micropore volume could be systematically controlled by varying the synthesis temperature and the TEOS/surfactant ratio.
Current understanding of the mechanism of sonodynamic action (i.e. the ultrasound-dependent enhancement of the cytotoxic action of certain drugs--sonosensitizers) with potential applications for cancer therapy is presented. The experimental evidence suggests that sonosensitization is due to the chemical activation of…
This short review focuses on recent advances in controlled polymerization and macromolecular architectonics by means of a variety of organized media with constrained geometries.
The overwhelming basicity of all analysed surfaces strongly dependent on the choice of liquid triplet used for contact angle measurements and the negative values sometimes obtained for the square roots of the acid-base parameters can be summarized as the main problems arising from the application of the Good-van Oss-C…